A.compass north and magnetic north
B.compass north and true north
C.magnetic meridian and the geographic meridian
D.your vessel's heading and the magnetic meridian
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A.can correct by adjusting the compass card
B.can correct by adjusting the compensating magnets
C.can correct by changing the vessel's heading
D.cannot correct
A.worn gears in the compass housing
B.magnetism from the earth's magnetic field
C.magnetism within the vessel
D.lack of oil in the compass bearings
A.deviation
B.variation
C.compass error
D.northerly error
A.the compass heading is in line with the lubber's line
B.there is no lost motion in the gimbal rings
C.no change of heading by compass is observed if you raise and lower the heeling magnet
D.the gimbal rings do not strike the compass frame when they are tilted
A.The Flinders bar
B.The heeling magnet
C.Quadrantal soft iron spheres
D.Bar magnets in the binnacle
最新試題
The MOST important feature of the material used for making the binnacle of a standard magnetic compass is that it is（）.
What is an advantage of the magnetic compass aboard vessels?（）
When a magnetic compass is not in use for a prolonged period of time it should（）.
The most accurate method of determining gyrocompass error while underway is by（）.
This induced magnetism（）the permanent magnetism already present in the ship.
What is used to correct for both induced and permanent magnetism，and consequently must be readjusted with radical changes in latitude（）.
A ship under construction or major repair will acquire permanent magnetism due to（）while sitting stationary in the earth’s magnetic field.
When a vessel changes course from one cardinal heading to another cardinal heading whilea djusting the compass，which action should be taken?（）
What is the name of the movable，radial guide line used to measure direction on a radar?（）
When relieving the helm，the new helmsman should know the（）.